CN103182129A

CN103182129A - By-pass valve

Info

Publication number: CN103182129A
Application number: CN2011104556889A
Authority: CN
Inventors: 郑殿会
Original assignee: Beijing Aeonmed Co Ltd
Current assignee: Beijing Aeonmed Co Ltd
Priority date: 2011-12-30
Filing date: 2011-12-30
Publication date: 2013-07-03
Anticipated expiration: 2031-12-30
Also published as: US20140053929A1; WO2013097688A1; US8967194B2; BR112013023220A2; EA025719B1; CN103182129B; EA201391161A1

Abstract

The invention discloses a by-pass valve. The by-pass valve comprises a valve body provided with both an air inlet and an air outlet, wherein a non-return valve is arranged at the air outlet and comprises a non-return valve body, an air-permeable plate and a first sealing gasket; a first gas passage for gas delivery is arranged in the non-return valve body; breather holes are formed in the air-permeable plate and communicated with the air outlet; the first sealing gasket is arranged between the air-permeable plate and the non-return valve body; and the first gas passage and the breather holes are selectively communicated with each other through the first sealing gasket. As the non-return valve is arranged at the air outlet of the by-pass valve, gas flows in only one direction, the problem of inaccurate anesthetic gas concentration caused by gas reflow is solved; and the by-pass valve has the advantages of structural manufacturability and better airtightness.

Description

Bypass valve

Technical field

The present invention relates to medical instruments field, relate in particular to a kind of bypass valve.

Background technology

Anesthetic machine is operating room safety, stability, the exigent equipment of ease for operation, it sends into anesthetics by mechanical circuit patient's alveolar, form the anesthetics partial pressure, after permeating into blood, inhibitory action is directly taken place in the central nervous system, thereby produce the effect of general anesthesia, anesthetic machine mainly comprises air supply system, volatilization jar, respirator and four parts of circuit system.

Anesthesia evaporator is the important composition parts on the anesthetic machine, and it provides stable, concentration to anaesthetize mist accurately by anesthetic machine to patient.It can effectively evaporate anesthetics; Can also control the output concentration of anesthesia steam accurately.

Anesthetic machine links to each other by bypass valve with anesthesia evaporator.When the access failure anesthesia evaporator, anesthetic machine is carried gas by bypass valve to patient end, this moment, bypass valve played the effect of the passage of carrying gas, so should guarantee gas does not outwards reveal, if air-tightness is good inadequately, just have portion gas and leak, cause the wasting of resources, the gas of bypass valve of also should guaranteeing simultaneously to flow through does not have vapour lock or vapour lock is very little, so that unobstructed provide gas to patient end; After connecting anesthesia evaporator, the gas delivery channels that bypass valve self has is closed, the all gas anesthesia evaporator of flowing through enters anesthetic machine by bypass valve again through vaporizer output, carries patient end, this moment, bypass valve should guarantee that anesthetis do not reveal, if air-tightness is bad, cause anesthetis to reveal, be not only the wasting of resources, to a kind of anesthesia of doctor, the quality of operation and patient's safety have been influenced greatly especially.

Traditional bypass valve all has air inlet and gas outlet, during work, gas enters vaporizer from air inlet through bypass valve, enter the anesthetic machine downstream through the bypass valve gas outlet again by vaporizer output, and then be delivered to patient end, in the actual mechanical process, when gas outlet pressure has fluctuation, will make back flow of gas, cause the anesthesia gas concentration exported accurate inadequately, make troubles to use; Also there is the processability of product structure defective in traditional bypass valve simultaneously, and air-tightness defective such as good inadequately.

Summary of the invention

The objective of the invention is to solve traditional bypass valve gas outlet when pressure oscillation is arranged, can cause the back flow of gas phenomenon, further cause the coarse problem of anesthesia gas concentration exported, a kind of bypass valve is provided, it arranges check valve by the gas outlet at bypass valve, make gas flow unique, can not cause the back flow of gas phenomenon, and have processability of product structure and the better advantage of air-tightness.

The objective of the invention is to be achieved through the following technical solutions:

A kind of bypass valve, comprise valve body, described valve body has air inlet and gas outlet, the place is provided with check valve in described gas outlet, described check valve comprises check valve valve body, air permeable plate and first sealing gasket, described check valve valve body inside has gas transmission first gas passage, has air-vent on the described air permeable plate, described air-vent is connected with described gas outlet, described first sealing gasket is arranged between air permeable plate and the check valve valve body, is communicated with by the first sealing gasket selectivity between described first gas passage and the air-vent.

Further, described valve body is provided with valve gap, has second gas passage in the described valve gap, have the 3rd gas passage, first cavity that communicates with air inlet, second cavity that communicates with first cavity in the described valve body, described second cavity and the 3rd gas passage are used for described bypass valve and carry gas when the access failure vaporizers, and described first cavity communicates with second cavity.

Preferably, the described valve body in corresponding described gas outlet is provided with the step cannelure, be respectively first cannelure and second cannelure, described air permeable plate is installed in described first cannelure, be close to described air permeable plate the outer face, by screw described check valve valve body is fastened on the described valve body, be provided with sealing ring at the joint of the joint of described air permeable plate and described valve body, described check valve valve body and described valve body.

Preferably, the described first cavity top has female thread, described valve gap coupling female thread is provided with external screw thread, so that described valve gap is threaded on the described valve body, ring cutting two grooves on described valve gap, and lay respectively at described externally threaded upper and lower both sides, and sealing ring is set all in two grooves, be used for strengthening air-tightness between described valve gap and the vaporizer at the sealing ring of described external screw thread upside, be used for strengthening air-tightness between described valve gap and the valve body at the sealing ring of described external screw thread downside;

Described the 3rd gas passage is arranged on the below of described first cavity, and communicate with the bottom of first cavity, so that being, described second gas passage and the 3rd gas passage be oppositely arranged, the outlet of corresponding described second gas passage arranges first boss in described valve gap bottom, and the import of corresponding described the 3rd gas passage arranges second boss in the bottom of described first cavity.

Further, be provided with the 3rd cannelure at the place, end that described check valve valve body and air permeable plate join, described the 3rd cannelure communicates with described first gas passage;

Described air permeable plate integral body is rounded, and at its outer rim ring cutting step surface is arranged, and is used for sealing ring is installed, and has centre bore on the described air permeable plate, also has some air-vents;

Be provided with first sealing gasket between described air permeable plate and the check valve valve body, by the motion of described first sealing gasket, realize that described gas outlet is communicated with the first gas passage selectivity.

Further, in the installing space of being formed by described second gas passage, first cavity, the 3rd gas passage, be provided with spool, described spool is provided with second sealing gasket, described second sealing gasket is between first boss and second boss, by moving up and down of described second sealing gasket, realize that first cavity is communicated with second gas passage, the 3rd gas passage selectivity.

Further, described first sealing gasket comprises integrated disc portions and rod member part, described rod member partly is arranged on the center of described integrated disc portions, described first sealing gasket is installed between described air permeable plate and the check valve valve body, so that described rod member partly passes described centre bore, and the length of described rod member part is greater than the thickness of described air permeable plate, described rod member part outer end is provided with limited cap, so that described first sealing gasket does not fall off in described air permeable plate, when described integrated disc portions is adjacent to described air permeable plate, be blocked described gas outlet and the blocking-up of described first gas passage between described air-vent and described the 3rd cannelure.

Further, described spool comprises gland, upper spring, valve rod, the lower spring that links to each other successively from top to bottom;

Described gland upper end has first projection, corresponding described first projection inwardly is provided with second projection in the upper end of described valve gap, described second projection is positioned at the import department of described second gas passage, by described first projection and the cooperating of second projection, described gland is limited in described second gas passage, described gland integral body is cylindrical, at its peripheral evenly rip cutting four straight flanges, and leaves the circular arc guide part in the center of straight flange.

Further, the external diameter of described integrated disc portions is less than the internal diameter of described the 3rd cannelure, be provided with the spacing preiection of some described integrated disc portions in described the 3rd cannelure, described the 3rd cannelure is communicated with described first gas passage, and gives vent to anger by being threaded in the outer end of described first gas passage and to use pipe joint.

Further, described gland bottom centre extends upward and has mounting groove, and the described mounting groove oral area of going up falls filleted corner, and described valve rod top center is extended downwards and had down mounting groove, described upper spring one end is installed in the mounting groove, and the other end is installed in down in the mounting groove;

Described valve rod middle part is provided with annular solid, described annular solid top has the conical surface, the lower surface of being close to described annular solid has the second sealing gasket mounting groove at described valve rod, described second sealing gasket is installed on the described valve rod by the second sealing gasket mounting groove, described lower spring is enclosed within described stem lower portion periphery, one end places in described the 3rd gas passage, and the other end contacts the lower surface of described second sealing gasket.

Beneficial effect of the present invention is: by the place, gas outlet at valve body check valve is set, when gas flow was normal flow direction, check valve was opened, and gas flows out smoothly; When pressure oscillation appears in the gas outlet, cause the gas reverse counterflow, this moment, closed check valve stoped the adverse current of gas so that the anesthesia gas concentration of output the same with setting value accurate reliably; Specifically, check valve comprises check valve valve body, air permeable plate, both by with the cooperating the unlatching that realizes check valve or close of first sealing gasket, when gas flow is normal flow direction, namely flow to the gas outlet from first cavity, under the effect of gas pressure, promote first sealing gasket to the first gas passage side shifting, making wins the slit occurs between sealing gasket and the air permeable plate, and gas flows to first gas passage from air-vent, realizes the output of gas; When the gas reverse counterflow, namely inwardly flow to from first gas passage, under the effect of gas pressure, make the sealing gasket of winning be adjacent to air permeable plate, further make win gas passage and gas outlet blocking-up, gas can not flow in the bypass valve from first gas passage; Be provided with the dual-seal circle by the joint at valve gap and valve body, strengthened the air-tightness between valve gap and valve body, the vaporizer; By the junction at joint, air permeable plate and the valve body of check valve valve body and valve body sealing ring is set all, has strengthened the air-tightness between check valve and the valve body.The contrast prior art, bypass valve of the present invention has can guarantee that gas flow is unique, simple in structure, the better advantage of air-tightness.

Description of drawings

The present invention is described in further detail with embodiment with reference to the accompanying drawings below.

Fig. 1 is the partial schematic sectional view of bypass valve of the present invention;

Fig. 2 is the cross-sectional schematic of the valve body shown in Fig. 1;

Fig. 3 is the cross-sectional schematic of the valve gap shown in Fig. 1;

Fig. 4 is the schematic perspective view of the gland shown in Fig. 1;

Fig. 5 is the cross-sectional schematic of the gland shown in Fig. 1;

Fig. 6 is the schematic perspective view of the valve rod shown in Fig. 1;

Fig. 7 is the cross-sectional schematic of the valve rod shown in Fig. 1;

Fig. 8 is the schematic perspective view of the check valve valve body shown in Fig. 1;

Fig. 9 is the cross-sectional schematic of the check valve valve body shown in Fig. 1;

Figure 10 is the schematic perspective view of the air permeable plate shown in Fig. 1;

Figure 11 is the cross-sectional schematic of the air permeable plate shown in Fig. 1;

Figure 12 is the schematic perspective view of first sealing gasket shown in Fig. 1.

Among the figure:

1, valve body; 11, first cavity; 12, second cavity; 13, the 3rd gas passage; 14, first cannelure; 15, second cannelure; 16, second boss; 17, first groove;

2, valve gap; 21, second gas passage; 22, second projection; 23, first boss; 24, second groove; 25, the 3rd groove;

3, spool;

31, gland; 311, first projection; 312, go up mounting groove; 313, guide part;

32, upper spring;

33, valve rod; 331, following mounting groove; 332, annular solid; 333, the second sealing gasket mounting groove;

34, lower spring;

35, second sealing gasket;

4, check valve;

41, check valve valve body; 411, first gas passage; 412, the 3rd cannelure; 413, spacing preiection;

42, air permeable plate; 421, air-vent; 422, step surface;

43, first sealing gasket; 431, integrated disc portions; 432, rod member part; 433, limited cap;

5, sealing ring;

6, pipe joint.

The specific embodiment

As shown in Figure 1, in present embodiment, bypass valve of the present invention, comprise valve body 1, valve body 1 has air inlet and gas outlet, the place is provided with check valve 4 in the gas outlet, check valve 4 comprises check valve valve body 41, air permeable plate 42 and first sealing gasket 43, check valve valve body 41 inside have gas transmission with first gas passage 411, has air-vent 421 on the air permeable plate 42, air-vent 421 is connected with the gas outlet, first sealing gasket 43 is arranged between air permeable plate 42 and the check valve valve body 41, be communicated with by first sealing gasket, 43 selectivitys between first gas passage 411 and the air-vent 421, when gas outwards flows out from the gas outlet, check valve 4 is opened, the slit appears between first sealing gasket 43 and the air permeable plate 42, so that be communicated with between air-vent 421 and first gas passage 411, realization gas is exported normally, when pressure oscillation appears in the gas outlet, the adverse current phenomenon appears in gas, and check valve 4 is closed, and first sealing gasket 43 is adjacent to air permeable plate 42, so that blocking-up between air-vent 421 and first gas passage 411, realization gas can not adverse current be gone into bypass valve.

Valve body 1 is provided with valve gap 2, is provided with spool 3 between valve gap 2 and the valve body 1, and second sealing gasket 35 is installed on the spool 3, and spool 3 comprises gland 31, upper spring 32, valve rod 33, the lower spring 34 that links to each other successively from top to bottom.

As shown in Figure 2, provided a specific embodiment of valve body, has first cavity 11 that communicates with the air inlet (not shown) on the valve body 1, second cavity 12 that communicates with first cavity 11, the 3rd gas passage 13, first cavity, 11 tops have female thread, be used for being threaded valve gap 2, second cavity 12 and the 3rd gas passage 13 are used for carrying gas when this bypass valve access failure vaporizer, the 3rd gas passage 13 is positioned at the below of first cavity 11, and communicate with the bottom of first cavity 11, the import of corresponding the 3rd gas passage 13 arranges second boss 16 in the bottom of first cavity 11, locate concentric two cannelures that have in the gas outlet, be respectively first cannelure 14 and second cannelure 15, also be provided with first groove, 17, the first cannelures 14 and for air permeable plate 42, the first grooves 17 inside that check valve is installed sealing ring 5 be set, because it is positioned at the joint of check valve and bypass valve, can play the bubble-tight effect of strengthening between check valve and the bypass valve.

As shown in Figure 3, provided a specific embodiment of valve gap, valve gap 2 adopts hollow structure, make its inside have second gas passage 21, its bottom is the outlet of second gas passage 21, the top is the import of second gas passage 21, anesthetic gases enters from import, discharge from outlet, the outlet of corresponding second gas passage 21 arranges first boss 23 in valve gap 2 bottoms, valve gap 2 tops inwardly have second projection 22, the middle part arranges external screw thread, be positioned at described externally threaded both sides up and down second groove 24 and the 3rd groove 25 are set respectively on valve gap 2, be provided with sealing ring 5 in second groove 24 and the 3rd groove 25, when valve gap 2 is installed on the valve body 1, guaranteed air-tightness between valve gap 2 and the vaporizer at the sealing ring 5 of threaded connection place upside, guaranteed to have good air-tightness between valve body 1 and the valve gap 2 at the sealing ring 5 of threaded connection place downside.

As Fig. 1, shown in 4～7, provided a specific embodiment of spool, spool 3 comprises gland 31, upper spring 32, valve rod 33, lower spring 34, gland 31 is whole cylindrical, the even rip cutting of its periphery has four straight flanges, described straight flange can make and form gas passage between valve gap 2 and the gland 31, and leave circular arc guide part 313 in the center of straight flange, guide part 313 can make gland 31 enough steadily reliable at valve gap 2 internal motions, gland 31 tops are provided with first projection 311, bottom centre extends upward and has mounting groove 312, last mounting groove 312 oral areas fall filleted corner, be convenient to the assembling with upper spring, the top center of valve rod 33 extension downwards has down mounting groove 331, the middle part of valve rod 33 is provided with annular solid 332, and the top of annular solid 332 has the conical surface, and the lower surface of being close to annular solid 332 has the second sealing gasket mounting groove 333 at valve rod 33.

During installation, upper spring 32 1 ends are installed in the mounting groove 312, the other end is installed in down in the mounting groove 331, second sealing gasket 35 is installed on the valve rod 33 by the second sealing gasket mounting groove 333, lower spring 34 is enclosed within the periphery, bottom of valve rod 33, one end places in the 3rd gas passage 13, the other end contacts the lower surface of second sealing gasket 35, then with spool 3 alignment valve gaps 2 inside, in compression,

lower spring

32,34 are tightened on valve gap 2 on the valve body 1, hold out against mutually by first projection, 311 and second projection 22, gland 31 is limited in second gas passage 21, because second gas passage 21 and the 3rd gas passage 13 are oppositely arranged, second sealing gasket 35 is between first boss 23 and second boss 16, when second sealing gasket 35 moves upward, and when holding out against with first boss 23, second gas passage 21 is by shutoff, and first cavity 11 is connected with the 3rd gas passage 13; When second sealing gasket 35 moves downward, and when holding out against with second boss 16, the 3rd gas passage 13 is by shutoff, and first cavity 11 is connected with second gas passage 21.

Shown in Fig. 1,8～12, provided a specific embodiment of check valve, check valve 4 is installed in the place, gas outlet, it comprises check valve valve body 41 and air permeable plate 42, has first gas passage 411 in the check valve valve body 41, have the 3rd cannelure 412 in the import department that is positioned at first gas passage 411, have some spacing preiections 413 in the 3rd cannelure, the exit of first gas passage 411 is by the pipe joint 6 that is threaded, also have screwed hole on the check valve valve body 41, it can be connected on the valve body 1 by screw;

Air permeable plate 42 is whole rounded, has centre bore on it, also has four air-vents 421, and air permeable plate 42 outer rim ring cuttings have step surface 422, and step surface 422 is provided with sealing ring 5;

Between air permeable plate 42 and check valve valve body 41, be provided with first sealing gasket 43, first sealing gasket 43 comprises integrated disc portions 431 and rod member part 432, rod member part 432 is arranged on the center of integrated disc portions 431, and the length of rod member part 432 is greater than the thickness of air permeable plate 42, rod member part 432 is moved back and forth in the centre bore of air permeable plate 42, in order to make first sealing gasket 43 air permeable plate 42 that do not come off, be provided with limited cap 433 in the end of rod member part 432, the overall dimensions of limited cap 433 is greater than the centre bore aperture, and some spacing preiections 413 are set in the 3rd cannelure 412, with the position of restriction integrated disc portions 431.

During installation, at first rod member part 432 and limited cap 433 are penetrated in the lump the centre bore of air permeable plate 42, then air permeable plate 42 and sealing ring 5 are installed in first cannelure 14 in the lump, so that limited cap 433 is positioned at second cannelure 15, again that integrated disc portions 431 is mutually bonding with rod member part 432, the sealing ring 5 of in first groove 17, packing into, and make integrated disc portions 431 corresponding with the 3rd cannelure 412, check valve valve body 41 is fastened on the valve body 1 by screw, because the external diameter of integrated disc portions 431 is less than the 3rd cannelure 412 internal diameters, integrated disc portions 431 places in the 3rd cannelure 412, when integrated disc portions 431 is adjacent to air permeable plate 42, but its shutoff air-vent 421, so that gas outlet and 411 blocking-up of first gas passage.

The operation principle of bypass valve of the present invention: as shown in Figure 1, only show the partial structurtes of bypass valve of the present invention among the figure, bypass valve is actual to have two identical valve gaps, be installed on the valve body, have two separate gas circuits in the valve body, when the access failure vaporizer, the actual effect of playing a gas passage of bypass valve of this moment, gas enters valve body from the air inlet pipe joint, finally from 12 outputs of second cavity; When bypass valve is connected vaporizer, two valve gaps all articulate vaporizer, (namely a vaporizer needs to cooperate with two valve gaps simultaneously, could realize and being connected of bypass valve), gas enters valve inner from the air inlet pipe joint, enter vaporizer from first valve gap again, enter valve body from vaporizer again through second valve gap then, export from the pipe joint of gas outlet at last.Wherein valve gap top periphery design becomes hexagonal structure, and it mainly acts on is the assembling that makes things convenient between itself and the valve body, and (being that the valve gap peripheral structure is mainly used in matching with assembly tool), each bypass valve can articulate one or more vaporizers simultaneously.

When the access failure vaporizer, the actual effect of playing a gas passage of bypass valve of this moment, second cavity 12 is the outlet side part of this gas passage, gland 31 is not depressed, under the elastic force effect of lower spring 34, second sealing gasket 35 holds out against first boss 23, second gas passage 21 is by shutoff, gas enters in first cavity 11 from air inlet, enter second cavity 12 and the 3rd gas passage 13 then, enter into the portion gas of the 3rd gas passage 13, enter second cavity 12 again, enter the anesthetic machine downstream by bypass valve pipeline and joint (not shown) again.

When connecting vaporizer, gland 31 is depressed, so that overcoming lower spring 34 elastic force, second sealing gasket 35 moves downward, and hold out against with second boss 16, the 3rd gas passage 13 is by shutoff, anesthetic gases enters first cavity 11 from second gas passage 21, because second cavity, 12 ends arrange plug, the gas passage that bypass valve self has is closed, make gas can only flow into the gas outlet, when entering into second cannelure, 15 inside, gas pressure promotes first sealing gasket 43 and moves right so that the slit occurs between first sealing gasket 43 and the air permeable plate 42, gas from air-vent 421 in this slit flows into the 3rd cannelure 412, and then flow in first gas passage 411, and from pipe joint 6 outputs.

When gas enters first gas passage 411 from pipe joint 6, when the adverse current phenomenon occurring, gas pressure promotes first sealing gasket 43 to left movement, and make integrated disc portions 431 be adjacent to air permeable plate 42, shutoff air-vent 421, so that block between first gas passage 411 and the gas outlet, gas can not flow in the valve body 1.

Claims

1. bypass valve, comprise valve body (1), described valve body (1) has air inlet and gas outlet, it is characterized in that: the place is provided with check valve (4) in described gas outlet, described check valve (4) comprises check valve valve body (41), air permeable plate (42) and first sealing gasket (43), described check valve valve body (41) inside has gas transmission with first gas passage (411), has air-vent (421) on the described air permeable plate (42), described air-vent (421) is connected with described gas outlet, described first sealing gasket (43) is arranged between air permeable plate (42) and the check valve valve body (41), is communicated with by first sealing gasket (43) selectivity between described first gas passage (411) and the air-vent (421).

2. bypass valve according to claim 1, it is characterized in that: described valve body (1) is provided with valve gap (2), has second gas passage (21) in the described valve gap (2), have the 3rd gas passage (13), first cavity (11) that communicates with air inlet, second cavity (12) that communicates with first cavity (11) in the described valve body (1), described second cavity (12) and the 3rd gas passage (13) are used for described bypass valve and carry gas when the access failure vaporizers.

3. bypass valve according to claim 1, it is characterized in that: the described valve body in corresponding described gas outlet (1) is provided with the step cannelure, be respectively first cannelure (14) and second cannelure (15), described air permeable plate (42) is installed in described first cannelure (14), the outer face of being close to described air permeable plate (42), by screw described check valve valve body (41) is fastened on the described valve body (1), at the joint of described air permeable plate (42) with described valve body (1), described check valve valve body (41) is provided with sealing ring (5) with the joint of described valve body (1).

4. bypass valve according to claim 2, it is characterized in that: described first cavity (11) top has female thread, described valve gap (2) coupling female thread is provided with external screw thread, so that described valve gap (2) is threaded on the described valve body (1), go up ring cutting two grooves at described valve gap (2), and lay respectively at described externally threaded on, following both sides, and sealing ring (5) is set all in two grooves, be positioned at the sealing ring (5) of described external screw thread upside for the air-tightness of strengthening between described valve gap (2) and the vaporizer, be positioned at the sealing ring (5) of described external screw thread downside for the air-tightness of strengthening between described valve gap (2) and the valve body (1);

Described the 3rd gas passage (13) is arranged on the below of described first cavity (11), and communicate with the bottom of first cavity (11), so that being with the 3rd gas passage (13), described second gas passage (21) is oppositely arranged, the outlet of corresponding described second gas passage (21) arranges first boss (23) in described valve gap (2) bottom, and the import of corresponding described the 3rd gas passage (13) arranges second boss (16) in the bottom of described first cavity (11).

5. bypass valve according to claim 3 is characterized in that: be provided with the 3rd cannelure (412) at the place, end that described check valve valve body (41) and air permeable plate (42) join, described the 3rd cannelure (412) communicates with described first gas passage (411);

Described air permeable plate (42) is whole rounded, and at its outer rim ring cutting step surface (422) is arranged, and is used for sealing ring is installed, and described air permeable plate has centre bore on (42), also has some air-vents (421);

Be provided with first sealing gasket (43) between described air permeable plate (42) and the check valve valve body (41), by the motion of described first sealing gasket (43), realize that described gas outlet is communicated with first gas passage (411) selectivity.

6. bypass valve according to claim 4, it is characterized in that: in the installing space of being formed by described second gas passage (21), first cavity (11), the 3rd gas passage (13), be provided with spool (3), described spool (3) is provided with second sealing gasket (35), described second sealing gasket (35) is positioned between first boss (23) and second boss (16), by moving up and down of described second sealing gasket (35), realize that first cavity (11) is communicated with second gas passage (21), the 3rd gas passage (13) selectivity.

7. bypass valve according to claim 5, it is characterized in that: described first sealing gasket (43) comprises integrated disc portions (431) and rod member part (432), described rod member part (432) is arranged on the center of described integrated disc portions (431), described first sealing gasket (43) is installed between described air permeable plate (42) and the check valve valve body (41), so that described rod member part (432) is passed described centre bore, and the length of described rod member part (432) is greater than the thickness of described air permeable plate (42), described rod member part (432) outer end is provided with limited cap (433), so that described first sealing gasket (43) does not fall off in described air permeable plate (42), when described integrated disc portions (431) is adjacent to described air permeable plate (42), be blocked described gas outlet and described first gas passage (411) blocking-up between described air-vent (421) and described the 3rd cannelure (412).

8. bypass valve according to claim 6 is characterized in that: described spool (3) comprises gland (31), upper spring (32), valve rod (33), the lower spring (34) that links to each other successively from top to bottom;

Described gland (31) upper end has first projection (311), corresponding described first projection (311) inwardly is provided with second projection (22) in the upper end of described valve gap (2), described second projection (22) is positioned at the import department of described second gas passage (21), by cooperating of described first projection (311) and second projection (22), described gland (31) is limited in described second gas passage (21), described gland (31) is whole cylindrical, at its peripheral evenly rip cutting four straight flanges, and leave circular arc guide part (313) in the center of straight flange.

9. bypass valve according to claim 7, it is characterized in that: the external diameter of described integrated disc portions (431) is less than the internal diameter of described the 3rd cannelure (412), be provided with the spacing preiection (413) of some described integrated disc portions in described the 3rd cannelure (412), described the 3rd cannelure (412) is communicated with described first gas passage (411), and gives vent to anger by being threaded with pipe joint (6) in the outer end of described first gas passage (411).

10. bypass valve according to claim 8, it is characterized in that: described gland (31) bottom centre extends upward and has mounting groove (312), and described mounting groove (312) oral area of going up falls filleted corner, described valve rod (33) top center extension downwards has down mounting groove (331), described upper spring (32) one ends are installed in the mounting groove (312), and the other end is installed in down in the mounting groove (331);

Described valve rod (33) middle part is provided with annular solid (332), described annular solid (332) top has the conical surface, the lower surface of being close to described annular solid (332) has the second sealing gasket mounting groove (333) at described valve rod (33), described second sealing gasket (35) is installed on the described valve rod (33) by the second sealing gasket mounting groove (333), described lower spring (34) is enclosed within described valve rod (33) periphery, bottom, one end places in described the 3rd gas passage (13), and the other end contacts the lower surface of described second sealing gasket (35).